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Author Topic: amiga 500 plus (dead?)  (Read 6264 times)

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Offline skywalkgrTopic starter

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amiga 500 plus (dead?)
« on: May 08, 2012, 08:30:18 AM »
Hello to everyone :)

I bought an amiga 500 plus computer from ebay/DE. The problem with this is when i power it on the green led (power) is blinking and i get a green screen on my tv.

I opened it and i removed the battery, it looks that there is no leak from battery but i am not an expert. The board is revision 8A (b52/rock lobster) with kickstart 2.04. I used also a tool and i removed fat agnus and i put it back again but with no luck.

Is there a person that he can help me with this? I can send the machine worldwide i dont care about the cost, i would like that it will be fixed :)

Thank you
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Offline haywirepc

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Re: amiga 500 plus (dead?)
« Reply #1 on: May 08, 2012, 10:24:58 AM »
I believe green screen is an indication of bad ram. Do you have a ram board in the underside (trapdoor) expansion? I've gotten a few 500's with good onboard ram but the expansion ram was bad somehow. If there is a ram expansion board in the underside port, remove it and see if it will boot.

Steven
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Offline spirantho

Re: amiga 500 plus (dead?)
« Reply #2 on: May 08, 2012, 10:31:09 AM »
If that doesn't fix it, it's probably a bad RAM chip.
There are people closer than myself but I could probably fix it if you really need to. I'm in the UK though, so postage would be expensive.
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #3 on: May 08, 2012, 11:07:11 AM »
Quote from: haywirepc;692198
I believe green screen is an indication of bad ram. Do you have a ram board in the underside (trapdoor) expansion? I've gotten a few 500's with good onboard ram but the expansion ram was bad somehow. If there is a ram expansion board in the underside port, remove it and see if it will boot.

Steven


Thanks for mention it, no i dont have something plugged in the underside (trapdoor).
I took  the expansion card (512k) from my other amiga 500 and put it to amiga 500+ with no luck :/
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #4 on: May 08, 2012, 11:12:21 AM »
Quote from: spirantho;692199
If that doesn't fix it, it's probably a bad RAM chip.
There are people closer than myself but I could probably fix it if you really need to. I'm in the UK though, so postage would be expensive.


YES?? :D This would be great!!
I can send the mainboard to UK and i am willing to pay for the service :D Can we arrange it?
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Offline zipper

Re: amiga 500 plus (dead?)
« Reply #5 on: May 08, 2012, 11:14:15 AM »
Give still a wiggle/push to every socketed chip. And look at the Agnus socket if it's not cracked; you could gently scrape the Agnus contacts to be sure that they pass the voltage thru. I had a 500 that gave green screen because of defective Agnus contact.
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Offline haywirepc

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Re: amiga 500 plus (dead?)
« Reply #6 on: May 08, 2012, 11:35:13 AM »
Yes thats another thing that sometimes works, push down hard on every socketed chip. Clean the motherboard, disconnect and reconnect everything tightly and try to boot it again...

Steven
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #7 on: May 08, 2012, 11:48:07 AM »
Quote from: zipper;692206
Give still a wiggle/push to every socketed chip. And look at the Agnus socket if it's not cracked; you could gently scrape the Agnus contacts to be sure that they pass the voltage thru. I had a 500 that gave green screen because of defective Agnus contact.


I pulled out fat agnus with tool extractor and i check the socket and it looks in great shape. When you say "you could gently scrape the agnus contacts to be sure that they pass the voltage thru" what do you mean? :) How i will do this? is there a possibility that i can harm the chip?
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #8 on: May 08, 2012, 11:57:36 AM »
Quote from: haywirepc;692208
Yes thats another thing that sometimes works, push down hard on every socketed chip. Clean the motherboard, disconnect and reconnect everything tightly and try to boot it again...

Steven


When you say push hard -- how hard is hard?? I hope i will not break something...
Everything seems to be in place except kickstart chip (close to agnus). i dont know if its normal but there is space between chip and the socket so i can see  through the other side of the chip.
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #9 on: May 08, 2012, 01:25:50 PM »
Close to the battery (on the left) there is one chip, the pins on this chip seems to be green , maybe its fluid from battery i dont know. Does anyone know what kind of chip this is?


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Offline spirantho

Re: amiga 500 plus (dead?)
« Reply #10 on: May 08, 2012, 01:29:43 PM »
Can you send us a close-up photo of the area? It shouldn't be green....
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Offline dougal

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Re: amiga 500 plus (dead?)
« Reply #11 on: May 08, 2012, 01:38:13 PM »
Look at the board very closely especially around the battery area. Take great care to look at the tracks / traces. See if you see any damage. (dark green / black etc..).

Get a digital multi-meter and set it to the continuity test mode (where if you touch the two leads it beeps) and check the traces close / close-ish to the battery area.

If any of them are damaged, clean them carefully with a circuit board cleaner spray & brush (toothbrush is good). If there is no continuity you will need to solder a bridge wire to bridge the broken trace.
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #12 on: May 08, 2012, 02:07:18 PM »
Quote from: spirantho;692226
Can you send us a close-up photo of the area? It shouldn't be green....


Here is the close-up photo, its not my mainboard. Its a picture from an amiga hardware site. I am at work now so its difficult to make a photo of the board


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Offline zipper

Re: amiga 500 plus (dead?)
« Reply #13 on: May 08, 2012, 02:26:23 PM »
SN74LS244N - LOGIC, BUFF/DVR TRI-ST OCTAL driver chip.
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Offline skywalkgrTopic starter

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Re: amiga 500 plus (dead?)
« Reply #14 on: May 08, 2012, 02:37:49 PM »
Quote from: zipper;692238
SN74LS244N - LOGIC, BUFF/DVR TRI-ST OCTAL driver chip.


i have a question , under SN74LS244N there is also a second code "FFCZ9133" i searched on ebay and i found some SN74LS244N from Texas instruments and also a few motorola. But the second code is not the same :/

Where i can find this chip?
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